JORDAN AND THOMPSON: FISHES OBTAINED IN JAPAN IN 1911. PAlgl 
the back from the occiput to the insertion of the dorsal is a rather firm rod of tissue 
immediately below the skin. Having but the single specimen, we are unwilling to 
dissect it to ascertain the nature of this structure. 
This is probably distinct from Nansenia grenlandica described from a single 
specimen from Greenland, but Reinhardt’s scanty account indicates no certain 
difference. 
Family SALMONID 4. 
19. Oncorhynchus keta (Walbaum). 
(Mem. Carn. Mus., Vol. VI, p. 9, fig. 8). 
Sendai. 
A breeding male, weighing 8 pounds; greenish, side silvery, barred with dirty 
crimson; no spots; top of dorsal black; A. 14, D. 12 or 13. Gill-rakers 10+13. 
Seales 130. Pyloric ceca about 100. Flesh orange, rather soft, becoming pale 
and mushy when cooked, palatable, but, at the best, much inferior to that of the 
Masu. 
This species, the Dog Salmon or Calico Salmon of Alaska, is the large salmon 
or Sake of Japan. It is very extensively salted, the flesh when salted being quite 
red. It ranges southward as far as the Tonegawa, north of Tokyo. No specimen 
in the Carnegie Museum. 
20. Oncorhynchus masou (Brevoort). (Plate XXIV, fig. 3.) 
(Salmo macrostomus Giinther). 
Lake Biwa, Sendai, Lake Chuzenji (planted in latter locality). No. 6002a. 
The Masu, the young being called Yamame or Yamabe, is a species close to the 
Silver Salmon (0. kisutch) of Alaska. It is common as far south as Lake Biwa, and 
is sometimes landlocked, as in Lake Chuzenji, where it has been artifically intro- 
duced. This is a true Oncorhynchus, all its individuals dying after spawning. 
There is no true trout, that is, no species of Salmo, native in Japan. 
The salmon called Oncorhynchus yessoénsis is not known to the Japanese 
Bureau of Fisheries and is probably not different from O. masou. O. kisutch is not 
certainly known from Japan, the specimens thus far called by that name being 
O. masou. Mr. Tokishiro Koshida of the Bureau of Fisheries informs us that the 
king Salmon, Oncorhynchus tschawytscha, known as ‘“‘ Masunosuke,”’ or Lord of the 
Salmon, is found in Nemuro and occasionally as far south as Hakodate. 
The ‘“‘ Benimasu”’ or Red Salmon, Oncorhynchus nerka, is common in Nemuro 
and landlocked in the lakes of that region. Oncorhynchus masou is known in 
Lake Chuzenji as ‘“‘ Hinemasu.”’ It was introduced there from Akita, and has 
become landlocked. 
